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History of Dilution Refrigeration
H. London, G.R. Clarke, and E. Mendoza proposed a prototype of continuous refrigerator in 1962.
It was realized in 1964 in the Kamerlingh Onnes Laboratorium at Leiden University by Das, P.; Ouboter, R. B.; Taconis, K. W. (1965). A Realization of a London‐Clarke‐Mendoza Type
Refrigerator. Low Temperature Physics LT9. p. 1253. (Tmin~220mK)